![]() (Do not highlight any of the indented Volumes) Highlight the Disk in the left hand panel, the Disk will be called Apple SSD. Restart your mac to your Recovery HD, select Disk Utility and press Continue.Ĭlick View in the menubar and select Show All Devices. Were you trying to do an Erase and Reinstall from your Recovery HD and the Apple Recovery Servers. macOS Sierra can only run on Disks formatted as Mac OS Extended (Journaled). If the mac had been running High Sierra, Mojave, Catalina, Big Sur or Monterey then the Disk would have been formattedĪs APFS. Which OS was on the mac before you tried to install macOS Sierra. Sierra won’t install to SSD, thanks to Eau Rouge… For information about servicing your Mac, see Find out how to service or repair your Mac. ![]() If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
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